RESOURCE-LIMITED GROWTH, COMPETITION, AND PREDATION - A MODEL AND EXPERIMENTAL STUDIES WITH BACTERIA AND BACTERIOPHAGE
RESOURCE-LIMITED GROWTH, COMPETITION, AND PREDATION - A MODEL AND EXPERIMENTAL STUDIES WITH BACTERIA AND BACTERIOPHAGE
复制标题
DOI：
10.1086/283134
复制
发表时间：
1977-01-01
影响因子：
2.9
通讯作者：
CHAO, L
中科院分区：
文献类型：
--
作者：
LEVIN, BR;STEWART, FM;CHAO, L
资源有限的人口增长，竞争和捕食模型的基础上提出的生物现实的假设之间的关系，资源和初级消费者的增长和初级消费者与捕食者的相互作用，捕食他们。考虑到一个均衡的栖息地，其中资源不断供应，废物不断清除。该模型的一般性质进行了检查和2个具体的情况下，研究了一些细节：1资源，1食饵和1捕食者;和1资源，2食饵和1捕食者。为了研究其有效性的理论预测进行了比较，从大肠杆菌和噬菌体T2的连续培养群体的实验结果。对于1种资源、1种食饵和1种捕食者，存在稳定的共存状态。给定特定的资源利用函数，可以确定这些平衡或振荡的水平以及稳定性所需的参数值的范围。在1捕食者-1食饵系统存在稳定平衡点的情况下，第二种群的初级消费者也可以保持完全抵抗捕食。在含有T2敏感性大肠杆菌的葡萄糖微量连续培养中观察到稳定的平衡。coli B和T2噬菌体。根据参数的估计值，实验系统落在模型预测的振荡将增加到种群最终灭绝的范围内。在含T2噬菌体和T2敏感的E. coli B和一株T2抗性的E. coli K12。这个系统满足了理论预测的稳定共存的条件。该模型的有效性进行了讨论，作为一个一般的模拟资源有限的增长，竞争和捕食的浮游物种。这些理论和实验结果的影响，竞争和捕食的一般理论和细菌和它们的毒性病毒共存的具体问题也被认为是。
A model of resource-limited population growth, competition and predation is presented based on biologically realistic assumptions about the relationship between resources and the growth of primary consumers and about the interaction of the primary consumers with the predators that prey upon them. Consideration is given to an equable habitat in which resources are continually supplied and wastes are continually removed. The general properties of this model are examined and 2 specific cases are studied in some detail: 1 resource, 1 prey and 1 predator; and 1 resource, 2 prey and 1 predator. To study its validity the theoretical predictions were compared with the experimental results from continuous-culture populations of the bacterium Escherichia coli and the phage T2. For 1 resource, 1 prey and 1 predator there are stable states of coexistence. Given specific resource utilization functions, the levels of these equilibria or oscillations and the range of parameter values required for stability can be determined. In situations where a stable equilibrium exists for the 1 predator-1 prey system, a 2nd population of primary consumers which is totally resistant to predation can also be maintained. Stable equilibria were observed in glucose minimal continuous cultures containing T2 sensitive E. coli B and T2 phage. With the estimated values of the parameters, the experimental system fell in the range where the model predicted that the oscillations would increase to the point where the populations would eventually become extinct. Stable equilibria were also observed for a glucose-limited chemostate culture containing T2 phage together with a T2-sensitive clone of E. coli B and a T2-resistant strain of E. coli K12. This system fulfilled the conditions under which the theory predicts that stable coexistence will occur. The validity of this model is discussed as a general analogue of resource limited growth, competition and predation in planktonic species. The implications of these theoretical and experimental results for the general theory of competition and predation and for the specific problem of coexistence for bacteria and their virulent viruses are also considered.